Modeling 3D objects in a virtual space has many advantages such as intuitive manipulation. To generate the 3D objects efficiently and precisely, it is useful to introduce optimal assisting methods by software instead of using the special equipment of force feedback displays. On the basis of this idea, we develop a 3D modeler VLEGO in a virtual environment. VLEGO simulates toy blocks, and introduces a number of manipulation assisting methods for virtual object manipulation. The methods have the following three features: (1) limiting the relative positions of primitives in discrete fashion, (2) detecting mutual interference among primitives, and adjusting the positions to avoid collision, and (3) making flexible two‐handed manipulation possible by the use of two 3D cursors. Thus, VLEGO can provide a virtual environment in which the intuitive and precise generation of shapes is possible without training. In this paper, the design principle and basic functions of VLEGO are described, and the effects on the working efficiency of the virtual object manipulation assisting methods of VLEGO are evaluated by experiments. © 1998 Scripta Technica, Electron Comm Jpn Pt 3, 81(11): 18–28, 1998
This paper describes a case study of building a prototype of an immersive three dimensional (3-D) modeler which supports simple two-handed operations. Designing 3-D objects in a virtual environment has a number of advantages for 3-D geometry creation over designing with traditional computer aided design (CAD) tools. In order to enhance the human-computer interaction in a virtual workspace, twohanded spatial input has been incorporated into a few 3-D designing applications. However, existing 3-D designing tools do not utilize two handed interaction for enhancing the interface sufficiently. Our prototype immersive modeler, VLEGO, employs some features of toy blocks to give flexible two-handed interaction for 3-D design. Features of VLEGO can be summarized as follows: Firstly, VLEGO supports various two-handed operations and hence it makes design environment intuitive and efficient. Secondly, possible location and orientation of primitives are discretely limited so that the user can arrange objects accurately with ease. Finally, the system automatically avoids collisions among primitives and adjusts their positions. As a result, precise design of 3-D objects can be achieved easily by using a set of two-handed operations in intuitive way. This paper describes the design and implementation of VLEGO as well as an experiment for examining the effectiveness of two-handed interaction.
Modeling 3D objects in a virtual space has many advantages such as intuitive manipulation. To generate the 3D objects efficiently and precisely, it is useful to introduce optimal assisting methods by software instead of using the special equipment of force feedback displays. On the basis of this idea, we develop a 3D modeler VLEGO in a virtual environment. VLEGO simulates toy blocks, and introduces a number of manipulation assisting methods for virtual object manipulation. The methods have the following three features: (1) limiting the relative positions of primitives in discrete fashion, (2) detecting mutual interference among primitives, and adjusting the positions to avoid collision, and (3) making flexible two-handed manipulation possible by the use of two 3D cursors. Thus, VLEGO can provide a virtual environment in which the intuitive and precise generation of shapes is possible without training. In this paper, the design principle and basic functions of VLEGO are described, and the effects on the working efficiency of the virtual object manipulation assisting methods of VLEGO are evaluated by experiments. © 1998 Scripta Technica, Electron Comm Jpn Pt 3, 81(11): 1828, 1998
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